You remain, they mirage, they collapse, we collage

Building on his last line “locked up abroad,” “abroad” can mean overseas or far away. That being said, Lu’s object of affection was seen from far away but unlike a mirage, when he got close, she/it did not disappear, like others.

A reference to Titanic was also made when he says “they collapse.” Here the word “abroad” means “overseas”, meaning unlike the Titanic, his relationship is a “collage”, pieces of relationship coming together, not “collapsing.”